The marshes undergo substantial changes in size during the year, with melting snows in springtime and autumn rainfall causing extensive flooding as the river overflows.

The park nestles a significant number of species that are globally threatened with extinction: Ferruginous duck (Aythya nyroca), White-tailed eagle (Haliaeetus albicilla) (just 2–3 pairs have been observed), Greater spotted eagle (Aquila clanga) (4–6 pairs), Corn crake (Crex crex), Great snipe (Gallinago media).

The presence of so many birds of national and international significance underscores the importance of this territory for the conservation of biodiversity of Polesie, Belarus and Europe as a whole.

[3] At the start of World War I, the marshes separated the Austro-Hungarian Fourth Army from the XII corps; the few roads that traversed the region were narrow and largely unimproved.

The Russians soon captured the valuable railhead at Lemberg (now Lviv), then in the far east of Austria-Hungary (now part of the western Ukraine), as a result.

The marshes divided the central and southern theatres of operation during World War II, and they served as a hideout for both Soviet and Polish partisans.